Hi Walter, The referrer reports are based on the internal URL filters.
So if you have put your domain in the list mywebsie.com, all the
subdomains will be considered as internal and will be stripped out of
the referrer reports. however I believe if you only listed a subdomain
subdomain.mywesite.com, only this subdomain will be considered as
internal and all the other subdomains will be under referrer.You might
want to use a custom prop to capture internal referrer. Best
regards.Alexis Cazes